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Binder-free selenium cathode material with self-supporting structure and preparation method thereof

A self-supporting structure and positive electrode material technology, applied to structural parts, battery electrodes, element selenium/tellurium, etc., to achieve good cycle performance, uniform appearance, and weight reduction

Active Publication Date: 2017-04-19
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, since the above-mentioned modification methods for selenium still cannot greatly improve its cycle performance, there is still a lot of room for improvement in the electrochemical performance of this material.

Method used

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  • Binder-free selenium cathode material with self-supporting structure and preparation method thereof
  • Binder-free selenium cathode material with self-supporting structure and preparation method thereof
  • Binder-free selenium cathode material with self-supporting structure and preparation method thereof

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preparation example Construction

[0026] The invention provides a high-performance selenium cathode material with no binder and self-supporting structure and a preparation method thereof. The phase and morphology of the high-performance binder-free, self-supporting selenium cathode material can be controlled by adjusting the experimental conditions, and the morphology is uniform and the size distribution is uniform; the preparation method uses a conductive network structure as the lining Using selenium dioxide as the selenium source, the selenium dioxide is reduced to elemental selenium with a suitable reducing agent under hydrothermal conditions, and deposited on the conductive network structure substrate, thereby preparing a binder-free, self- Supported selenium cathode material. The present invention mainly lies in that, using selenium dioxide and a suitable reducing agent as raw materials, by controlling the reaction temperature, reaction time, type of reducing agent and reactant concentration of the syste...

Embodiment 1

[0042] 1 mmol of selenium dioxide was dissolved in 40 ml of deionized water to obtain a uniform selenous acid solution, and then 2 mmol of ethylenediaminetetraacetic acid was dissolved in the above selenous acid solution, and stirred at room temperature for 60 minutes. At the same time, the carbon fiber paper was cut into long strips of suitable size, ultrasonicated in absolute ethanol for 10 minutes, repeated ultrasonication 3 times, and then rinsed with absolute ethanol. Then the above mixed solution and carbon fiber paper were placed in a reaction kettle, and hydrothermally reacted at 150° C. for 24 hours. After the reaction, the obtained carbon fiber paper with deposits was washed several times with absolute ethanol and deionized water, and dried in an oven at 60° C. for several hours to obtain a selenium material with no binder and a self-supporting structure.

[0043] The samples were characterized by XRD and SEM, respectively as Figure 1a , as shown in 1b. It can be s...

Embodiment 2

[0048] 1 mmol of selenium dioxide was dissolved in 40 ml of deionized water to obtain a uniform selenous acid solution, and then 2 mmol of ethylenediaminetetraacetic acid was dissolved in the above selenous acid solution, and stirred at room temperature for 60 minutes. At the same time, the carbon fiber paper was cut into long strips of suitable size, ultrasonicated in absolute ethanol for 10 minutes, repeated ultrasonication 3 times, and then rinsed with absolute ethanol. Then the above mixed solution and carbon fiber paper were placed in a reaction kettle, and hydrothermally reacted at 180° C. for 24 hours. After the reaction, the obtained carbon fiber paper with deposits was washed several times with absolute ethanol and deionized water, and dried in an oven at 60° C. for several hours to obtain a selenium material with no binder and a self-supporting structure.

[0049] The samples were characterized by XRD and SEM, respectively as Figure 2a , as shown in 2b. It can be ...

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Abstract

The invention relates to a binder-free selenium cathode material with self-supporting structure and a preparation method thereof. The preparation method comprises the following steps: Step 1) dissolving selenium dioxide in deionized water to obtain a uniform seleninic acid solution, and dissolving a reducing agent in the seleninic acid solution to obtain an uniformly-mixed solution, wherein molar concentration of selenium dioxide is 0.01-1 mol / liter, and molar concentration of the reducing agent is 0.01-0.5 mol / liter; Step 2) putting the solution obtained in the Step 1) and a conductive network structured substrate in a reaction vessel and heating at the temperature of 50-250 DEG C for 1-96 h; and Step 3) washing the sediment-attached conductive network structured substrate with anhydrous ethanol and deionized water at least once, and drying at the temperature of 40-100 DEG C so as to obtain the binder-free selenium cathode material with a self-supporting structure. The invention has characteristics as follows: the process is simple; cost is low; and the morphology is controllable. The preparation method of the invention is a preparation method suitable for large-scale production.

Description

technical field [0001] The invention relates to a selenium cathode material with no binder and self-supporting structure and a preparation method thereof, belonging to the field of energy materials. Background technique [0002] With the rapid development of the economy and the increasing energy consumption, lithium secondary batteries have attracted more and more attention because of their advantages such as high open circuit voltage, high energy density, long cycle life, no pollution, and no memory effect. With the development of various electronic products in the direction of "light, small and thin", secondary lithium batteries with high energy density have always been the goal pursued by people. However, the current commercial lithium-ion battery cathode materials mainly focus on the lithium intercalation mechanism of layered compounds, so the capacity density is limited, such as LiFePO, which is currently considered to be the most promising cathode material for commerci...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/139H01M4/13C01B19/02
CPCC01B19/02H01M4/13H01M4/139H01M4/38Y02E60/10
Inventor 温兆银郭静王清松靳俊马国强吴相伟
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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